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B
Nostoc
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C
Eubacteria
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D
Blue green algae
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Solution
The correct option is A Diatoms Bacteria, Eubacteria and Nostoc (Blue green algae) are prokaryotic organisms. They lack true cell organelles. They posses nucleoid instead of a true nucleus. Nucleoid is a genetic material without a nuclear envelope. The cell wall is made up of peptidoglycan. Peptidoglycan is a polymer made up of sugars and amino acids. It is also called as murein.